土壤学报2016，Vol.53Issue(2)：375-387,13.DOI:10.11766/trxb201507240211
汶川震区滑坡堆积体坡面土壤侵蚀率及水动力学参数研究
Research on Soil Erosion Rate and Hydrodynamic Parameters of Landslide Accumulation Slope in Wenchuan Earthquake Area
摘要
Abstract
Landslide accumulations in the earthquake area of Wenchuan are formed typically of mixtures of rock fragments and soil,loose in structure. Drastic rill or gully erosion tends to occur with rainfall runoff, thus leading to grave soil and water loss. Therefore it is of great importance to launch a study on rules of water and sediment transport with runoff on landslide accumulation slopes. Based on field investigation,an indoor scouring experiment,designed to have 4 treatments in rock fragment and soil ratio(0∶1,1∶3, 1∶2 and 1∶1),3 treatments in water flow rate(4,8 and 12 L min-1)and 2 treatments in nearest dwell angle(34° and 36°)was carried out to study variations of soil erosion rate and hydrodynamic parameters and their relationships on landslide accumulation slopes in the Wenchuan earthquake area. Results show that with the souring experiment going on,the soil erosion rate,flowing power and specific flowing power gradually decreased,while water flow shear force increased at first then decreased,and specific energy at water flow cross-section decreased at first,then increased and decreased at last. On slopes,0∶1,1∶3 and 1∶1 in rock/soil ratio,soil erosion rate,water flow shear force,flowing power,and specific energy at water flow cross-section,increased with increasing water flow rate,but on slopes,1∶2 in rock/soil ratio,only soil erosion rate increased with increasing water flow rate and the other indices varied irregularly. In this study, the effects of water flow shear force,flowing power and specific energy at water flow cross-sectionon soil erosion rate could all be described with power function equations,and the effect of specific flowing power was not so obvious. All the findings in this study may help lay down a foundation for establishment of a model for predicting soil erosion on landslide accumulation slopes in the earthquake areas of Wenchuan.关键词
汶川震区/土石混合/土壤侵蚀率/水动力学参数Key words
Wenchuan earthquake/Earth-rock mixture/Soil erosion rate/Hydrodynamic parameters分类
农业科技引用本文复制引用
王仁新,何丙辉,李天阳,陈展鹏,张劲松..汶川震区滑坡堆积体坡面土壤侵蚀率及水动力学参数研究[J].土壤学报,2016,53(2):375-387,13.基金项目
国家自然科学基金项目（41271291）资助 Supported by the National Natural Science Foundation of China （）
